XML 106 R82.htm IDEA: XBRL DOCUMENT

Business Segments - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Segment Reporting Disclosure [Line Items]
Number of reportable business segments	3
Marketable land-based drilling rigs	328
Long-lived assets	$ 3,167,266	$ 2,620,900
West Texas and southeastern New Mexico
Segment Reporting Disclosure [Line Items]
Marketable land-based drilling rigs	64
North central and east Texas, northern Louisiana and Mississippi
Segment Reporting Disclosure [Line Items]
Marketable land-based drilling rigs	73
Rocky Mountain region (Colorado, Utah, Wyoming, Montana and North Dakota)
Segment Reporting Disclosure [Line Items]
Marketable land-based drilling rigs	48
South Texas and southern Louisiana
Segment Reporting Disclosure [Line Items]
Marketable land-based drilling rigs	62
Texas panhandle, Oklahoma and Arkansas
Segment Reporting Disclosure [Line Items]
Marketable land-based drilling rigs	27
Appalachian Basin
Segment Reporting Disclosure [Line Items]
Marketable land-based drilling rigs	34
Western Canada
Segment Reporting Disclosure [Line Items]
Marketable land-based drilling rigs	20
Canada \| Contract Drilling
Segment Reporting Disclosure [Line Items]
Oil and gas services	106,000	65,700	45,400
Long-lived assets	$ 69,800	$ 70,700

Tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year; net of accumulated depreciation. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

+ References+ Details